﻿/************************************************************************

   Extended WPF Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 

   This program can be provided to you by Xceed Software Inc. under a
   proprietary commercial license agreement for use in non-Open Source
   projects. The commercial version of Extended WPF Toolkit also includes
   priority technical support, commercial updates, and many additional 
   useful WPF controls if you license Xceed Business Suite for WPF.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Globalization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace Xceed.Wpf.Toolkit.Core.Utilities
{
  static class CalculatorUtilities
  {
    public static Calculator.CalculatorButtonType GetCalculatorButtonTypeFromText( string text )
    {
      switch( text )
      {
        case "0":
          return Calculator.CalculatorButtonType.Zero;
        case "1":
          return Calculator.CalculatorButtonType.One;
        case "2":
          return Calculator.CalculatorButtonType.Two;
        case "3":
          return Calculator.CalculatorButtonType.Three;
        case "4":
          return Calculator.CalculatorButtonType.Four;
        case "5":
          return Calculator.CalculatorButtonType.Five;
        case "6":
          return Calculator.CalculatorButtonType.Six;
        case "7":
          return Calculator.CalculatorButtonType.Seven;
        case "8":
          return Calculator.CalculatorButtonType.Eight;
        case "9":
          return Calculator.CalculatorButtonType.Nine;
        case "+":
          return Calculator.CalculatorButtonType.Add;
        case "-":
          return Calculator.CalculatorButtonType.Subtract;
        case "*":
          return Calculator.CalculatorButtonType.Multiply;
        case "/":
          return Calculator.CalculatorButtonType.Divide;
        case "%":
          return Calculator.CalculatorButtonType.Percent;
        case "\b":
          return Calculator.CalculatorButtonType.Back;
        case "\r":
        case "=":
          return Calculator.CalculatorButtonType.Equal;
      }

      //the check for the decimal is not in the switch statement. To help localize we check against the current culture's decimal seperator
      if( text == CultureInfo.CurrentCulture.NumberFormat.CurrencyDecimalSeparator )
        return Calculator.CalculatorButtonType.Decimal;

      //check for the escape key
      if( text == ( ( char )27 ).ToString() )
        return Calculator.CalculatorButtonType.Clear;

      return Calculator.CalculatorButtonType.None;
    }

    public static Button FindButtonByCalculatorButtonType( DependencyObject parent, Calculator.CalculatorButtonType type )
    {
      for( int i = 0; i < VisualTreeHelper.GetChildrenCount( parent ); i++ )
      {
        var child = VisualTreeHelper.GetChild( parent, i );

        object buttonType = child.GetValue( Button.CommandParameterProperty );

        if( buttonType != null && ( Calculator.CalculatorButtonType )buttonType == type )
        {
          return child as Button;
        }
        else
        {
          var result = FindButtonByCalculatorButtonType( child, type );

          if( result != null )
            return result;
        }
      }
      return null;
    }

    public static string GetCalculatorButtonContent( Calculator.CalculatorButtonType type )
    {
      string content = string.Empty;
      switch( type )
      {
        case Calculator.CalculatorButtonType.Add:
          content = "+";
          break;
        case Calculator.CalculatorButtonType.Back:
          content = "Back";
          break;
        case Calculator.CalculatorButtonType.Cancel:
          content = "CE";
          break;
        case Calculator.CalculatorButtonType.Clear:
          content = "C";
          break;
        case Calculator.CalculatorButtonType.Decimal:
          content = CultureInfo.CurrentCulture.NumberFormat.CurrencyDecimalSeparator;
          break;
        case Calculator.CalculatorButtonType.Divide:
          content = "/";
          break;
        case Calculator.CalculatorButtonType.Eight:
          content = "8";
          break;
        case Calculator.CalculatorButtonType.Equal:
          content = "=";
          break;
        case Calculator.CalculatorButtonType.Five:
          content = "5";
          break;
        case Calculator.CalculatorButtonType.Four:
          content = "4";
          break;
        case Calculator.CalculatorButtonType.Fraction:
          content = "1/x";
          break;
        case Calculator.CalculatorButtonType.MAdd:
          content = "M+";
          break;
        case Calculator.CalculatorButtonType.MC:
          content = "MC";
          break;
        case Calculator.CalculatorButtonType.MR:
          content = "MR";
          break;
        case Calculator.CalculatorButtonType.MS:
          content = "MS";
          break;
        case Calculator.CalculatorButtonType.MSub:
          content = "M-";
          break;
        case Calculator.CalculatorButtonType.Multiply:
          content = "*";
          break;
        case Calculator.CalculatorButtonType.Nine:
          content = "9";
          break;
        case Calculator.CalculatorButtonType.None:
          break;
        case Calculator.CalculatorButtonType.One:
          content = "1";
          break;
        case Calculator.CalculatorButtonType.Percent:
          content = "%";
          break;
        case Calculator.CalculatorButtonType.Seven:
          content = "7";
          break;
        case Calculator.CalculatorButtonType.Negate:
          content = "+/-";
          break;
        case Calculator.CalculatorButtonType.Six:
          content = "6";
          break;
        case Calculator.CalculatorButtonType.Sqrt:
          content = "Sqrt";
          break;
        case Calculator.CalculatorButtonType.Subtract:
          content = "-";
          break;
        case Calculator.CalculatorButtonType.Three:
          content = "3";
          break;
        case Calculator.CalculatorButtonType.Two:
          content = "2";
          break;
        case Calculator.CalculatorButtonType.Zero:
          content = "0";
          break;
      }
      return content;
    }

    public static bool IsDigit( Calculator.CalculatorButtonType buttonType )
    {
      switch( buttonType )
      {
        case Calculator.CalculatorButtonType.Zero:
        case Calculator.CalculatorButtonType.One:
        case Calculator.CalculatorButtonType.Two:
        case Calculator.CalculatorButtonType.Three:
        case Calculator.CalculatorButtonType.Four:
        case Calculator.CalculatorButtonType.Five:
        case Calculator.CalculatorButtonType.Six:
        case Calculator.CalculatorButtonType.Seven:
        case Calculator.CalculatorButtonType.Eight:
        case Calculator.CalculatorButtonType.Nine:
        case Calculator.CalculatorButtonType.Decimal:
          return true;
        default:
          return false;
      }
    }

    public static bool IsMemory( Calculator.CalculatorButtonType buttonType )
    {
      switch( buttonType )
      {
        case Calculator.CalculatorButtonType.MAdd:
        case Calculator.CalculatorButtonType.MC:
        case Calculator.CalculatorButtonType.MR:
        case Calculator.CalculatorButtonType.MS:
        case Calculator.CalculatorButtonType.MSub:
          return true;
        default:
          return false;
      }
    }

    public static decimal ParseDecimal( string text )
    {
      return Decimal.Parse( text, CultureInfo.CurrentCulture );
    }

    public static decimal Add( decimal firstNumber, decimal secondNumber )
    {
      return firstNumber + secondNumber;
    }

    public static decimal Subtract( decimal firstNumber, decimal secondNumber )
    {
      return firstNumber - secondNumber;
    }

    public static decimal Multiply( decimal firstNumber, decimal secondNumber )
    {
      return firstNumber * secondNumber;
    }

    public static decimal Divide( decimal firstNumber, decimal secondNumber )
    {
      return firstNumber / secondNumber;
    }

    public static decimal Percent( decimal firstNumber, decimal secondNumber )
    {
      return firstNumber * secondNumber / 100M;
    }

    public static decimal SquareRoot( decimal operand )
    {
      return Convert.ToDecimal( Math.Sqrt( Convert.ToDouble( operand ) ) );
    }

    public static decimal Fraction( decimal operand )
    {
      return 1 / operand;
    }

    public static decimal Negate( decimal operand )
    {
      return operand * -1M;
    }
  }
}
